Slow-Release Nitrogen Calculator

Release curve and timing from product and temperature.

Coating / product type

Total N applied (lbs/acre)

Avg soil temperature (°F)

Days after application

Product rate (lbs/acre)

Product N content (%)

Tab to move between fields

Cumulative N released (%)

25.9%

N available (lbs/acre)

25.9

N still coated (lbs/acre)74.1

Current daily release (lbs/acre/day)0.37

Released at 14 days (%)6.8%

Released at 30 days (%)13.9%

Released at 60 days (%)25.9%

Released at 90 days (%)36.2%

Days to 50% release138.6

Days to 80% release321.9

How to Use This Calculator

Select Coating/Product Type: PCU (polymer-coated), SCU (sulfur-coated), Methylene Urea, IBDU, or Uncoated Urea.
Enter Total N Applied (lbs/acre), Product Rate (lbs/acre), and Product N Content (%).
Set Average Soil Temperature (°F) — higher temperatures accelerate release for PCU and SCU products.
Enter Days After Application to calculate cumulative release at a specific point in the season.
Review Cumulative N Released (%), N Available (lbs/acre), N Still Coated, and Daily Release Rate to match release curve to crop uptake.

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